The Golden Proportion: Using Implants to Restore Facial Balance

Patients who have lost teeth frequently describe a change they find difficult to articulate. It is not simply that there is a gap. Something about the face has altered — the lips sit differently, the lower part of the face looks shorter, one side appears to have dropped relative to the other.

They are usually right, and the explanation is structural rather than imagined. Teeth do more than chew. They hold the vertical relationship between the jaws, they support the lips from behind, and the bone that houses them maintains the contours of the lower face. Remove them, and all three change.

This article looks at the proportional principles used when planning implant treatment to address that, and — equally importantly — at the limits of what those principles can achieve.

Bone volume reduces. Alveolar bone exists to support teeth. Once a tooth is gone, the bone around the socket resorbs, most rapidly in the first months and then more slowly but continuously. Width is lost before height. Over years this produces visible narrowing of the ridge and, where many teeth have been lost, a reduction in the overall contour of the jaw. Our article on alveolar ridge preservation explains what can be done at the time of extraction to limit this.

Lip support diminishes. The upper lip rests against the front teeth and the bone behind them. Remove that support and the lip loses projection, the vermilion border rolls inward, and the lip appears thinner. This is a mechanical effect, not a skin change.

Facial height reduces. When posterior teeth are lost, the jaws can close further than they should. The chin rotates upwards and forwards, the distance from nose to chin shortens, and folds deepen at the corners of the mouth. Our article on collapsed smiles and facial volume discusses this in an orthodontic context; the same mechanism operates after tooth loss.

Asymmetry emerges. Where loss has been greater on one side, resorption and altered function follow that pattern. Chewing shifts to the other side, muscle bulk changes accordingly, and the two sides of the face diverge over time.

The term "golden proportion" refers to a ratio of approximately 1:1.618, which appears in classical design and has been applied to dental aesthetics since the 1970s. In practice, clinicians use a set of proportional relationships, of which this is one, as planning references rather than as rules.

Anterior tooth proportion. Viewed straight on, the visible width of the lateral incisor is often close to 62 per cent of the central incisor's width, and the visible width of the canine close to 62 per cent of the lateral's. This describes what the eye sees in perspective, not the actual widths of the teeth.

Width-to-height ratio of the central incisor. Commonly cited in the region of 75 to 85 per cent. Teeth that fall outside this range tend to read as too short or too narrow.

Facial thirds. The face divides roughly into three vertical sections — hairline to brow, brow to base of nose, base of nose to chin. Tooth loss shortens the lower third. Restoring appropriate tooth height restores the relationship.

Midline and horizontal references. The dental midline should ideally sit close to the facial midline, and the line joining the biting edges of the front teeth should run roughly parallel to the line between the pupils. A cant in the occlusal plane is more noticeable to observers than a midline shift of similar magnitude.

Smile arc. The curve formed by the biting edges of the upper front teeth ideally follows the curvature of the lower lip when smiling. A flat arc is one of the commonest reasons restorations look artificial despite being well made.

This deserves emphasis, because proportional systems are sometimes presented with more authority than they warrant.

Studies measuring natural, attractive smiles find that relatively few conform closely to the golden proportion. Real faces vary by sex, ethnicity, age and individual character. A young woman and an older man with the same tooth proportions would not both look natural — tooth display, incisal wear and lip mobility all change with age, and a design that ignores this produces a result that looks technically correct and somehow wrong.

Applied sensibly, these ratios are a starting framework and a cross-check. Applied rigidly, they produce the uniform, overly regular appearance that many people recognise immediately as dental work.

Our article on the golden ratio in smile design discusses the same tension in cosmetic treatment.

Implants preserve bone in the area they occupy. Because they transmit functional load into bone, the immediate surrounding area retains stimulus that would otherwise be absent. This does not reverse resorption that has already occurred, but it alters the trajectory. Our article on biological changes after implant placement explains the process.

Position is planned from the restoration backwards. This is the central principle of contemporary implant dentistry. The desired final tooth position is established first — using a digital design or wax-up based on facial references — and the implant position is then derived from it. Placing implants where bone happens to be plentiful and designing the teeth around them afterwards is what produces restorations that function adequately but look wrong.

Prosthetic design restores lip support. In full arch cases, the flange or ridge lap contour of the bridge can be shaped to support the lip where bone has been lost. How much support is needed is assessed with the provisional restoration in place, by looking at the face rather than at the teeth.

Vertical dimension is re-established. Where facial height has reduced, the restoration can be built to a greater height. This must be tested in a provisional phase, because increasing the vertical dimension changes muscle length, speech and joint position, and not every planned increase is tolerated.

Angled placement addresses limited bone. Tilting posterior implants allows engagement of denser bone without grafting, which makes treatment feasible for many patients with advanced resorption. Our article on All-on-4 biomechanics covers the engineering.

In the visible zone, the gum is often more difficult to get right than the tooth.

The papillae between teeth depend on the bone crest beneath them. Where that bone has been lost, the papilla cannot be reliably recreated by soft tissue technique alone, and the result can be a dark triangle between restorations. Managing this may involve grafting, prosthetic contouring, or accepting a compromise and designing around it.

The gum margin height around an implant crown also has to match its neighbours, which depends on how the implant was positioned three-dimensionally and how the emergence profile was shaped during healing. Our article on whether gum shape affects implant results covers this in more detail, and our discussion of gingival zenith alignment explains how the target position is determined.

Being direct about this matters more than the theory.

Reasonable to expect: restoration of chewing function, re-establishment of lower facial height where it has reduced, improved lip support, a smile designed to facial references, and a slowing of further bone loss in the treated areas.

Not reasonable to expect: correction of skeletal asymmetry, which is a bone-structure issue rather than a dental one; a perfectly symmetrical face, since nobody has one; complete regeneration of bone that has already been lost; or the appearance of a much younger person. Implant treatment addresses the dental contribution to facial appearance. It does not address the rest of it, and treatment presented as facial rejuvenation is overstating its scope.

Outcomes vary between individuals, and the starting point — how much bone remains, how long teeth have been missing, the underlying facial structure — has more influence on the result than any technique.

Can implants make my face look fuller?

Where facial height has reduced because of tooth loss, restoring it does change the appearance of the lower face and the support of the lips. The effect is real but moderate, and it restores what was there rather than adding volume. Any promise of a dramatic facial change from dental treatment alone should be treated with caution.

How is the right tooth size decided?

From facial references — the amount of tooth showing at rest, the position of the lip when smiling, the facial midline and the interpupillary line — combined with proportional guidelines and any records of how your teeth looked previously. Old photographs are genuinely useful here.

Will the result look obviously artificial?

Restorations that follow the proportional and facial references described above, and that incorporate the minor irregularities present in natural dentitions, generally do not draw attention. Results that look artificial usually do so because the teeth are too uniform, too white, too flat in their arrangement, or set to a smile arc that does not follow the lower lip.

What if I have been missing teeth for many years?

Treatment is often still possible, though reduced bone volume affects planning and may require grafting or angled placement techniques. Our article on All-on-4 with low bone density covers the options.

Can a single implant in the front of the mouth be matched to my other teeth?

It is achievable but it is among the more demanding things in restorative dentistry, because both the crown and the surrounding gum have to match a neighbour that the eye can compare it with directly. The principles are similar to those discussed in matching a single veneer.

Do I need a CBCT scan for this kind of planning?

For implant treatment, three-dimensional imaging is generally needed to assess bone volume and anatomy accurately. Two-dimensional radiographs do not show ridge width, which is usually the limiting dimension.

If you have noticed changes in how your face looks since losing teeth, that observation is clinically relevant and worth raising directly at a consultation. It also tends to change the emphasis of the plan, because restoring facial support is a different design objective from simply filling a gap.

Photographs from before the teeth were lost are among the most useful things you can bring.

You can contact our team to arrange an assessment at our Wimpole Street practice. Our dental implants and smile makeover pages describe what is involved.

This article provides general information and does not constitute individual dental advice. Suitability for implant treatment can only be determined following clinical examination, three-dimensional imaging and review of your medical history. Implant treatment carries surgical risks and requires ongoing maintenance. Changes to facial appearance following treatment vary considerably between individuals and depend on the starting condition. Wimpole Dental is regulated by the Care Quality Commission, and our clinicians are registered with the General Dental Council.

Next review due: 27 August 2027